Master's MateSafety Initiative Network
The Master's Mate Safety Initiative Network (MMSIn) — like AAA for the ocean, but free & community-driven. Cruisers keeping each other safe: anchor-drag & distress alerts, a verified captains directory, and a watch network that has your back.
Tug
SEA LION
MMSI 367530470 · Call sign WDN4054
Not yet on Master's MateType
Tug
Flag
USALength
18 m
Beam
7 m
Draft
3 m
Call sign
WDN4054
Official No.
557400
First reported
Jun 2026
Last reported
Jun 2026
AIS reports
87
On the American registry, SEA LION is an 18-metre tug. Her hull carries a beam measuring 7 metres and a draft measuring 3 metres. Look for MMSI 367530470, call sign WDN4054. Bring SEA LION aboard the Master's Mate Safety Initiative Network — free, and every captain on it has the others' backs.
Free forever · No credit card · for working boats
Built for boats that work — like SEA LION.
Engine & systems telemetry, live AIS, weather and distress alerting for the vessels that earn their keep.
Rig her out — free →Takes 60 seconds · Your data stays yours · Built by cruisers, for cruisers
Live AIS position · Jun 9, 2026 20:05 UTC
Position
29.8220° N, 93.3393° W
Status
Under way (engine)
Speed
0.0 kn
Course
247°
Destination
CAMERON LA
ETA
06-08 08:00 UTC
Working the Gulf of Mexico? You're never out there alone.
Thousands of cruisers on the Master's Mate Network — ready to help the moment something goes wrong.
Free with your claim · for working boats
The most powerful cruising platform ever built — yours, free.
Joining the Safety Initiative Network doesn't just put SEA LION on the map. It hands you the full bridge:
Systems Monitoring
Batteries, bilge, tanks, Victron & NMEA 2000 telemetry — your whole boat on one dashboard.
Live AIS & Traffic
See every vessel around you in real time. Closest-approach warnings before they matter.
Weather & Routing
GRIB wind, swell & current on the chart. Plan passages with ETA-calibrated forecasts per leg.
Distress Mesh
Mayday & Pan-Pan that ripple out to nearby cruisers — a watch network that has your back.
Anchor Watch
GPS-precise drag alarms that actually wake you — and your whole crew. Sleep through the night.
Worldwide Charts
Navionics-grade vector charts, satellite & raster overlays, online or off. Your whole cruising ground.
Onboard Cameras
Watch your boat from anywhere — live feeds and 24h recording, straight from your gateway.
Hail Any Captain
A verified captains directory + direct hailing. Reach the boat next to you, or across the bay.
Claim SEA LION and switch it all on
Free to join · nothing to install to start · cancel anytime
About SEA LION
What kind of vessel is SEA LION?
SEA LION is a Tug flagged to United States of America.
Where was SEA LION last seen?
SEA LION was last reported in the Gulf of Mexico in Jun 2026 on public AIS.
What is SEA LION's MMSI?
SEA LION's MMSI is 367530470. Call sign WDN4054.
How big is SEA LION?
SEA LION is about 18 m long, 7 m on the beam, drawing 3 m.
Is SEA LION on the Master's Mate Safety Initiative Network?
Not yet. If SEA LION is your boat, you can claim it free and join the Master's Mate Safety Initiative Network (MMSIn).
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